English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Magnetic and electrical properties of four series of rare earth cobaltates ofthe formula La0.7-xLnxCa0.3CoO3 with Ln = Pr, Nd, Gd and Dy have beeninvestigated. Compositions close to x = 0.0 contain large ferromagneticclusters or domains, and show Brillouin-like behaviour of the field-cooled DCmagnetization data with fairly high ferromagnetic Tc values, besides lowelectrical resistivities with near-zero temperature coefficients. Thezero-field-cooled data generally show a non-monotonic behaviour with a peak ata temperatures slightly lower than Tc. The near x = 0.0 compositions show aprominent peak corresponding to the Tc in the AC-susceptibility data. Theferromagnetic Tc varies linearly with x or the average radius of the A-sitecations, (rA). With increase in x or decrease in (rA), the magnetization valueat any given temperature decreases markedly and the AC-susceptibilitymeasurements show a prominent transition arising from small magnetic clusterswith some characteristics of a spin-glass. Electrical resistivity increaseswith increase in x, showed a significant increase around a critical value of xor (rA), at which composition the small clusters also begin to dominate. Theseproperties can be understood in terms of a phase separation scenario whereinlarge magnetic clusters give way to smaller ones with increase in x, with bothtypes of clusters being present in certain compositions. The changes inmagnetic and electrical properties occur parallely since the largeferromagnetic clusters are hole-rich and the small clusters are hole-poor.Variable-range hopping seems to occur at low temperatures in these cobaltates.Comment: 23 pages including figure

journal of physics. condensed matter

Magnetic and electron transport properties of the rare earth cobaltates, La0.7 xLnxCa0.3CoO3(Ln = Pr, Nd, Gd and Dy): a case of phase separation